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Message from discussion U-571 movie (OT)
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William Rowden  
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 More options May 5 2000, 3:00 am
Newsgroups: sci.crypt
From: William Rowden <rowd...@eskimo.com>
Date: 2000/05/05
Subject: Re: U-571 movie (OT)
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In article <3911E3D1.6FF7F...@acm.org>,
  Jim Gillogly <j...@acm.org> wrote:
> Paul Matthews wrote:
> > Hello, I believe that one of failings of the original Enigma code books was
> > the codes were "too" random.

[snip one of several refutations in this thread]
> > bods are Bletchley Park quickly realised this and this substantially cut
> > down the permutations to find the day's settings.

[snip more contrary evidence]

IIRC, one of the characteristics of the Enigma that Bletchley Park
*did* exploit was that no letter would be enciphered as itself.  This
reduced the number of locations a probable plaintext could appear in
the ciphertext.

According to the NOVA program "Decoding Nazi Secrets," when letters
(for transmitting the daily key, if memory servers) were chosen by the
operators, they were often not very random.  The group "MAD" would be
matched with "RID", "BER" with "LIN", "HIT" with "LER", etc. (I'm not
making a comparison; Godwin's Law does not apply.  :-])

Perhaps someone else knows more detail about these weaknesses.
--
    -William
SPAM filtered; damages claimed for UCE according to RCW19.86
PGP key: http://www.eskimo.com/~rowdenw/pgp/rowdenw.asc until 2000-08-01
Fingerprint: FB4B E2CD 25AF 95E5 ADBB  DA28 379D 47DB 599E 0B1A

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